diff --git a/.gitignore b/.gitignore
index 57ee54b..9b297b0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,3 @@
-/chrony-4.4.tar.gz
-/chrony-4.4-tar-gz-asc.txt
-/clknetsim-ef2a7a.tar.gz
+/chrony-4.5-pre1-tar-gz-asc.txt
+/chrony-4.5-pre1.tar.gz
+/clknetsim-5d1dc0.tar.gz
diff --git a/chrony.spec b/chrony.spec
index 0a0bb92..c72af99 100644
--- a/chrony.spec
+++ b/chrony.spec
@@ -1,5 +1,6 @@
 %global _hardened_build 1
-%global clknetsim_ver ef2a7a
+%global clknetsim_ver 5d1dc0
+%global prerelease -pre1
 %bcond_without debug
 %bcond_without nts
 
@@ -8,7 +9,7 @@
 %endif
 
 Name:           chrony
-Version:        4.4
+Version:        4.5
 Release:        1%{?dist}
 Summary:        An NTP client/server
 
diff --git a/sources b/sources
index 1c8d2e0..7493175 100644
--- a/sources
+++ b/sources
@@ -1,3 +1,3 @@
-SHA512 (chrony-4.4.tar.gz) = 45e060eb0c5892552f28dc436429e5823409cc93533127af27b64d08ff9c769fdc72694272232114f5ca1884c2bc8b5e842fae7956dc457358e937bcd3dda4d7
-SHA512 (chrony-4.4-tar-gz-asc.txt) = bb795b428567434937cbf3a12c559b549b89abe65010d04eed0fbdcfde35e7266771ea01c2c5581f3e5fae993f1782fff5a62c5ae09259d2b65dab9473d756a3
-SHA512 (clknetsim-ef2a7a.tar.gz) = 55196099d975d635fcba7dce9e1bc42efe0aee25777c9ff0bc996e300922e70542ea784a78814dc888c2f7f281e9d7db68c893e2d3138e92fbc3fb1e64e7e2b6
+SHA512 (chrony-4.5-pre1-tar-gz-asc.txt) = 60030c572957afe2289ca3f20efaf92267d3f6eca1e8c220f9b24bcfacbfc830304151d47c048bdcb1972a6ed9c84e7e435fafd4276080ecb253b991087ce20f
+SHA512 (chrony-4.5-pre1.tar.gz) = 1be4beb1257baf08a6c35613a5c547837f63aeab0f06b87dff1acdd912a49f79b276f376af7737c6d44bf6ba974829dddddee5e9153828abf90f828e749d8f6e
+SHA512 (clknetsim-5d1dc0.tar.gz) = 76889da425dc9d63ba78811661d78ffa922a63c4f83aeb809fef02c866f64a97b09dd4b0906ccfd1e20cee5091d8b886aadfce54cd338d3bf597b0e976a78927